PdfImageCompression

PdfImageCompression enumeration

Specifies the type of compression applied to images in the PDF file.

public enum PdfImageCompression

Values

Name Value Description
Auto 0 Automatically selects the most appropriate compression for each image.
Jpeg 1 Jpeg compression. Does not support transparency.

Examples

Shows how to specify a compression type for all images in a document that we are converting to PDF.

Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

builder.Writeln("Jpeg image:");
builder.InsertImage(ImageDir + "Logo.jpg");
builder.InsertParagraph();
builder.Writeln("Png image:");
builder.InsertImage(ImageDir + "Transparent background logo.png");

// Create a "PdfSaveOptions" object that we can pass to the document's "Save" method
// to modify how that method converts the document to .PDF.
PdfSaveOptions pdfSaveOptions = new PdfSaveOptions();

// Set the "ImageCompression" property to "PdfImageCompression.Auto" to use the
// "ImageCompression" property to control the quality of the Jpeg images that end up in the output PDF.
// Set the "ImageCompression" property to "PdfImageCompression.Jpeg" to use the
// "ImageCompression" property to control the quality of all images that end up in the output PDF.
pdfSaveOptions.ImageCompression = pdfImageCompression;

// Set the "JpegQuality" property to "10" to strengthen compression at the cost of image quality.
pdfSaveOptions.JpegQuality = 10;

doc.Save(ArtifactsDir + "PdfSaveOptions.ImageCompression.pdf", pdfSaveOptions);

See Also